Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSACTUATOR CHECK
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Actuator Check
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Actuator Check
NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.
PRE-CHECK
1. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown the diagram, it is possible to enter the diagnosis check mode.
2. INDICATOR CHECK
a. Turn the ignition switch ON while pressing the A/C control AUTO switch and R/F switch simultaneously.
b. Check that the indicators light up and go off at second intervals 4 times in succession.
HINT:
- After the indicator check is completed, the system enters the DTC begins automatically.
- Press the OFF switch when desiring to cancel the check mode.
3. DTC CHECK (SENSOR CHECK)
a. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
b. Read the code displayed on the panel. Refer to the list of codes. (Trouble code are output at the temperature display.)
c. If the slower display is desired, press the FRONT DEF switch and change it to stepped operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
4. CLEARING DTC
a. To clear diagnostic trouble code, there are 2 ways.
1. During sensor check, press the FRONT DEF switch and REAR DEF switch at the same time.
2. Pull the ECU-B fuse in engine room J/B for 20 sec. or longer to clear the DTC memory.
5. ACTUATOR CHECK
a. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
b. Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
If the slower display is desired, press the FRONT DEF switch and change it to step operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.
ACTUATOR CHECK
a. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
b. Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
If the slower display is desired, press the FRONT DEF switch and change it to step operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.
PRE-CHECK
1. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown the diagram, it is possible to enter the diagnosis check mode.
2. INDICATOR CHECK
a. Turn the ignition switch ON while pressing the A/C control AUTO switch and R/F switch simultaneously.
b. Check that the indicators light up and go off at second intervals 4 times in succession.
HINT:
- After the indicator check is completed, the system enters the DTC begins automatically.
- Press the OFF switch when desiring to cancel the check mode.
3. DTC CHECK (SENSOR CHECK)
a. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
b. Read the code displayed on the panel. Refer to the list of codes. (Trouble code are output at the temperature display.)
c. If the slower display is desired, press the FRONT DEF switch and change it to stepped operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
4. CLEARING DTC
a. To clear diagnostic trouble code, there are 2 ways.
1. During sensor check, press the FRONT DEF switch and REAR DEF switch at the same time.
2. Pull the ECU-B fuse in engine room J/B for 20 sec. or longer to clear the DTC memory.
5. ACTUATOR CHECK
a. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
b. Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
If the slower display is desired, press the FRONT DEF switch and change it to step operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.
ACTUATOR CHECK
a. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
b. Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
If the slower display is desired, press the FRONT DEF switch and change it to step operation. Each time the FRONT DEF switch is pressed, the display changes by 1 step.
HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.